High blood pressure that comes on suddenly can be caused by a number of things such as lack of sleep, sleep apnea, certain medications, stress, getting too hot, kidney problems etc.
You can take apple cider vinegar to help lower your blood pressure.
Take a glass and fill it with warm water, lemon juice, honey and apple cider vinegar and stir it up to make a tonic that will lower your blood pressure.
If you continue to have sudden high blood pressure you need to speak with a doctor since high blood pressure can lead to strokes, heart disease, heart attacks and even death.